Passport Application Services - Plainfield 201 Watchung Ave Plainfield, NJ 07060 Phone : (908) 226-5220 Business Category Passport Application Services Toll-Free           (800) ASK-USPS Fax           (650) 577-4408 Post Office - Plainfield 201 Watchung Ave Plainfield, NJ 07060 Phone : (908) 226-5220 Business Category Post Offices Toll-Free           (800) ASK-USPS Fax           (650) 577-4408